ing an Among fatal plane crashes that occurred during the past 60 years, 490 were due to pilot error, 96 were due to other human error, 529 were due to weather, 467 were due to mechanical problems, and 200 were due to sabotage. Construct the relative frequency distribution. What is the most serious threat to aviation safety, and can anything be done about it? Complete the relative frequency distribution below Cause Pilot error Other human error Weather Mechanical problems Sabotage Relative Frequency (Round to one decimal place as needed)